US PATENT SUBCLASS 34 / 559
.~.~.~ Subatmospheric pressure

Current as of: June, 1999
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34 /   HD   DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS

523  DF  APPARATUS {40}
524  DF  .~ With automatic control {11}
558  DF  .~.~ Of gas or vapor pressure in treating enclosure {1}
559.~.~.~ Subatmospheric pressure

DEFINITION

Classification: 34/559

Subatmospheric pressure:

(under subclass 558) Apparatus wherein the pressure in the enclosure is below atmospheric or under a vacuum.